I moved into DP's house two years ago. He was very naive when he bought it in 2006 and got interest only mortgage expecting that as house prices rise & rise he could sell it for a massive profit in a couple of years. Fast forward to 2013 after the crash and the house is now in around £20k negative equity. We have the opportunity to move to repayment over 20, 25 or 30 years. Obviously this will increase our monthly payments. We want to move to somewhere a bit bigger in the next few years and need to decide if we pay as much mortgage off as possible or pay a bit less off & save as well (we can't afford to pay more off & save). We really need to sit down and figure out all the options available to us - including anything we might not have thought of or known about. We want professional advice but I can't work out if we need a mortgage advisor specifically or if an Independent Financial Advisor would be able to help in more depth.
HELP!!
Which is most qualified to offer is the right advice?